1228669885 has 4 divisors (see below), whose sum is σ = 1474403868. Its totient is φ = 982935904.

The previous prime is 1228669879. The next prime is 1228669889. The reversal of 1228669885 is 5889668221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236482884 + 992187001 = 15378^2 + 31499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228669885 - 2¹¹ = 1228667837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228669889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122866984 + ... + 122866993.

It is an arithmetic number, because the mean of its divisors is an integer number (368600967).

Almost surely, 2^1228669885 is an apocalyptic number.

It is an amenable number.

1228669885 is a deficient number, since it is larger than the sum of its proper divisors (245733983).

1228669885 is an equidigital number, since it uses as much as digits as its factorization.

1228669885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245733982.

The product of its digits is 3317760, while the sum is 55.

The square root of 1228669885 is about 35052.3877218086. The cubic root of 1228669885 is about 1071.0549135590.

The spelling of 1228669885 in words is "one billion, two hundred twenty-eight million, six hundred sixty-nine thousand, eight hundred eighty-five".